1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "base/process/process_metrics.h"
6 
7 #include <limits.h>
8 #include <stddef.h>
9 #include <stdint.h>
10 #include <sys/resource.h>
11 #include <sys/time.h>
12 #include <unistd.h>
13 
14 #include "base/logging.h"
15 #include "build/build_config.h"
16 
17 namespace base {
18 
TimeValToMicroseconds(const struct timeval & tv)19 int64_t TimeValToMicroseconds(const struct timeval& tv) {
20   int64_t ret = tv.tv_sec;  // Avoid (int * int) integer overflow.
21   ret *= Time::kMicrosecondsPerSecond;
22   ret += tv.tv_usec;
23   return ret;
24 }
25 
~ProcessMetrics()26 ProcessMetrics::~ProcessMetrics() { }
27 
28 #if defined(OS_LINUX)
29 static const rlim_t kSystemDefaultMaxFds = 8192;
30 #elif defined(OS_MACOSX)
31 static const rlim_t kSystemDefaultMaxFds = 256;
32 #elif defined(OS_SOLARIS)
33 static const rlim_t kSystemDefaultMaxFds = 8192;
34 #elif defined(OS_FREEBSD)
35 static const rlim_t kSystemDefaultMaxFds = 8192;
36 #elif defined(OS_OPENBSD)
37 static const rlim_t kSystemDefaultMaxFds = 256;
38 #elif defined(OS_ANDROID)
39 static const rlim_t kSystemDefaultMaxFds = 1024;
40 #endif
41 
GetMaxFds()42 size_t GetMaxFds() {
43   rlim_t max_fds;
44   struct rlimit nofile;
45   if (getrlimit(RLIMIT_NOFILE, &nofile)) {
46     // getrlimit failed. Take a best guess.
47     max_fds = kSystemDefaultMaxFds;
48     RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed");
49   } else {
50     max_fds = nofile.rlim_cur;
51   }
52 
53   if (max_fds > INT_MAX)
54     max_fds = INT_MAX;
55 
56   return static_cast<size_t>(max_fds);
57 }
58 
59 
SetFdLimit(unsigned int max_descriptors)60 void SetFdLimit(unsigned int max_descriptors) {
61   struct rlimit limits;
62   if (getrlimit(RLIMIT_NOFILE, &limits) == 0) {
63     unsigned int new_limit = max_descriptors;
64     if (limits.rlim_max > 0 && limits.rlim_max < max_descriptors) {
65       new_limit = limits.rlim_max;
66     }
67     limits.rlim_cur = new_limit;
68     if (setrlimit(RLIMIT_NOFILE, &limits) != 0) {
69       PLOG(INFO) << "Failed to set file descriptor limit";
70     }
71   } else {
72     PLOG(INFO) << "Failed to get file descriptor limit";
73   }
74 }
75 
GetPageSize()76 size_t GetPageSize() {
77   return getpagesize();
78 }
79 
80 }  // namespace base
81